#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int NumberOf1(int n)
{
    int i = 0;
    int count = 0;
    while (i < 32)
    {
        if ((n >> i)^0 == 1)
        {
            count++;
        }
        i++;
    }
    return count;
}

int main()
{
    int n = 0;
    scanf("%d", &n);
    int ret = NumberOf1(n);
    printf("%d", ret);
    return 0;
}
